/*!
 * vue-i18n v8.14.1
 * (c) 2019 kazuya kawaguchi
 * Released under the MIT License.
 */
(function (global, factory) {
    typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
        typeof define === 'function' && define.amd ? define(factory) :
            (global.VueI18n = factory());
}(this, (function () { 'use strict';

    /*  */

    /**
     * constants
     */

    var numberFormatKeys = [
        'style',
        'currency',
        'currencyDisplay',
        'useGrouping',
        'minimumIntegerDigits',
        'minimumFractionDigits',
        'maximumFractionDigits',
        'minimumSignificantDigits',
        'maximumSignificantDigits',
        'localeMatcher',
        'formatMatcher'
    ];

    /**
     * utilities
     */

    function warn (msg, err) {
        if (typeof console !== 'undefined') {
            console.warn('[vue-i18n] ' + msg);
            /* istanbul ignore if */
            if (err) {
                console.warn(err.stack);
            }
        }
    }

    function error (msg, err) {
        if (typeof console !== 'undefined') {
            console.error('[vue-i18n] ' + msg);
            /* istanbul ignore if */
            if (err) {
                console.error(err.stack);
            }
        }
    }

    function isObject (obj) {
        return obj !== null && typeof obj === 'object'
    }

    var toString = Object.prototype.toString;
    var OBJECT_STRING = '[object Object]';
    function isPlainObject (obj) {
        return toString.call(obj) === OBJECT_STRING
    }

    function isNull (val) {
        return val === null || val === undefined
    }

    function parseArgs () {
        var args = [], len = arguments.length;
        while ( len-- ) args[ len ] = arguments[ len ];

        var locale = null;
        var params = null;
        if (args.length === 1) {
            if (isObject(args[0]) || Array.isArray(args[0])) {
                params = args[0];
            } else if (typeof args[0] === 'string') {
                locale = args[0];
            }
        } else if (args.length === 2) {
            if (typeof args[0] === 'string') {
                locale = args[0];
            }
            /* istanbul ignore if */
            if (isObject(args[1]) || Array.isArray(args[1])) {
                params = args[1];
            }
        }

        return { locale: locale, params: params }
    }

    function looseClone (obj) {
        return JSON.parse(JSON.stringify(obj))
    }

    function remove (arr, item) {
        if (arr.length) {
            var index = arr.indexOf(item);
            if (index > -1) {
                return arr.splice(index, 1)
            }
        }
    }

    var hasOwnProperty = Object.prototype.hasOwnProperty;
    function hasOwn (obj, key) {
        return hasOwnProperty.call(obj, key)
    }

    function merge (target) {
        var arguments$1 = arguments;

        var output = Object(target);
        for (var i = 1; i < arguments.length; i++) {
            var source = arguments$1[i];
            if (source !== undefined && source !== null) {
                var key = (void 0);
                for (key in source) {
                    if (hasOwn(source, key)) {
                        if (isObject(source[key])) {
                            output[key] = merge(output[key], source[key]);
                        } else {
                            output[key] = source[key];
                        }
                    }
                }
            }
        }
        return output
    }

    function looseEqual (a, b) {
        if (a === b) { return true }
        var isObjectA = isObject(a);
        var isObjectB = isObject(b);
        if (isObjectA && isObjectB) {
            try {
                var isArrayA = Array.isArray(a);
                var isArrayB = Array.isArray(b);
                if (isArrayA && isArrayB) {
                    return a.length === b.length && a.every(function (e, i) {
                        return looseEqual(e, b[i])
                    })
                } else if (!isArrayA && !isArrayB) {
                    var keysA = Object.keys(a);
                    var keysB = Object.keys(b);
                    return keysA.length === keysB.length && keysA.every(function (key) {
                        return looseEqual(a[key], b[key])
                    })
                } else {
                    /* istanbul ignore next */
                    return false
                }
            } catch (e) {
                /* istanbul ignore next */
                return false
            }
        } else if (!isObjectA && !isObjectB) {
            return String(a) === String(b)
        } else {
            return false
        }
    }

    /*  */

    function extend (Vue) {
        if (!Vue.prototype.hasOwnProperty('$i18n')) {
            // $FlowFixMe
            Object.defineProperty(Vue.prototype, '$i18n', {
                get: function get () { return this._i18n }
            });
        }

        Vue.prototype.$t = function (key) {
            var values = [], len = arguments.length - 1;
            while ( len-- > 0 ) values[ len ] = arguments[ len + 1 ];

            var i18n = this.$i18n;
            return i18n._t.apply(i18n, [ key, i18n.locale, i18n._getMessages(), this ].concat( values ))
        };

        Vue.prototype.$tc = function (key, choice) {
            var values = [], len = arguments.length - 2;
            while ( len-- > 0 ) values[ len ] = arguments[ len + 2 ];

            var i18n = this.$i18n;
            return i18n._tc.apply(i18n, [ key, i18n.locale, i18n._getMessages(), this, choice ].concat( values ))
        };

        Vue.prototype.$te = function (key, locale) {
            var i18n = this.$i18n;
            return i18n._te(key, i18n.locale, i18n._getMessages(), locale)
        };

        Vue.prototype.$d = function (value) {
            var ref;

            var args = [], len = arguments.length - 1;
            while ( len-- > 0 ) args[ len ] = arguments[ len + 1 ];
            return (ref = this.$i18n).d.apply(ref, [ value ].concat( args ))
        };

        Vue.prototype.$n = function (value) {
            var ref;

            var args = [], len = arguments.length - 1;
            while ( len-- > 0 ) args[ len ] = arguments[ len + 1 ];
            return (ref = this.$i18n).n.apply(ref, [ value ].concat( args ))
        };
    }

    /*  */

    var mixin = {
        beforeCreate: function beforeCreate () {
            var options = this.$options;
            options.i18n = options.i18n || (options.__i18n ? {} : null);

            if (options.i18n) {
                if (options.i18n instanceof VueI18n) {
                    // init locale messages via custom blocks
                    if (options.__i18n) {
                        try {
                            var localeMessages = {};
                            options.__i18n.forEach(function (resource) {
                                localeMessages = merge(localeMessages, JSON.parse(resource));
                            });
                            Object.keys(localeMessages).forEach(function (locale) {
                                options.i18n.mergeLocaleMessage(locale, localeMessages[locale]);
                            });
                        } catch (e) {
                            {
                                warn("Cannot parse locale messages via custom blocks.", e);
                            }
                        }
                    }
                    this._i18n = options.i18n;
                    this._i18nWatcher = this._i18n.watchI18nData();
                } else if (isPlainObject(options.i18n)) {
                    // component local i18n
                    if (this.$root && this.$root.$i18n && this.$root.$i18n instanceof VueI18n) {
                        options.i18n.root = this.$root;
                        options.i18n.formatter = this.$root.$i18n.formatter;
                        options.i18n.fallbackLocale = this.$root.$i18n.fallbackLocale;
                        options.i18n.formatFallbackMessages = this.$root.$i18n.formatFallbackMessages;
                        options.i18n.silentTranslationWarn = this.$root.$i18n.silentTranslationWarn;
                        options.i18n.silentFallbackWarn = this.$root.$i18n.silentFallbackWarn;
                        options.i18n.pluralizationRules = this.$root.$i18n.pluralizationRules;
                        options.i18n.preserveDirectiveContent = this.$root.$i18n.preserveDirectiveContent;
                    }

                    // init locale messages via custom blocks
                    if (options.__i18n) {
                        try {
                            var localeMessages$1 = {};
                            options.__i18n.forEach(function (resource) {
                                localeMessages$1 = merge(localeMessages$1, JSON.parse(resource));
                            });
                            options.i18n.messages = localeMessages$1;
                        } catch (e) {
                            {
                                warn("Cannot parse locale messages via custom blocks.", e);
                            }
                        }
                    }

                    var ref = options.i18n;
                    var sharedMessages = ref.sharedMessages;
                    if (sharedMessages && isPlainObject(sharedMessages)) {
                        options.i18n.messages = merge(options.i18n.messages, sharedMessages);
                    }

                    this._i18n = new VueI18n(options.i18n);
                    this._i18nWatcher = this._i18n.watchI18nData();

                    if (options.i18n.sync === undefined || !!options.i18n.sync) {
                        this._localeWatcher = this.$i18n.watchLocale();
                    }
                } else {
                    {
                        warn("Cannot be interpreted 'i18n' option.");
                    }
                }
            } else if (this.$root && this.$root.$i18n && this.$root.$i18n instanceof VueI18n) {
                // root i18n
                this._i18n = this.$root.$i18n;
            } else if (options.parent && options.parent.$i18n && options.parent.$i18n instanceof VueI18n) {
                // parent i18n
                this._i18n = options.parent.$i18n;
            }
        },

        beforeMount: function beforeMount () {
            var options = this.$options;
            options.i18n = options.i18n || (options.__i18n ? {} : null);

            if (options.i18n) {
                if (options.i18n instanceof VueI18n) {
                    // init locale messages via custom blocks
                    this._i18n.subscribeDataChanging(this);
                    this._subscribing = true;
                } else if (isPlainObject(options.i18n)) {
                    this._i18n.subscribeDataChanging(this);
                    this._subscribing = true;
                } else {
                    {
                        warn("Cannot be interpreted 'i18n' option.");
                    }
                }
            } else if (this.$root && this.$root.$i18n && this.$root.$i18n instanceof VueI18n) {
                this._i18n.subscribeDataChanging(this);
                this._subscribing = true;
            } else if (options.parent && options.parent.$i18n && options.parent.$i18n instanceof VueI18n) {
                this._i18n.subscribeDataChanging(this);
                this._subscribing = true;
            }
        },

        beforeDestroy: function beforeDestroy () {
            if (!this._i18n) { return }

            var self = this;
            this.$nextTick(function () {
                if (self._subscribing) {
                    self._i18n.unsubscribeDataChanging(self);
                    delete self._subscribing;
                }

                if (self._i18nWatcher) {
                    self._i18nWatcher();
                    self._i18n.destroyVM();
                    delete self._i18nWatcher;
                }

                if (self._localeWatcher) {
                    self._localeWatcher();
                    delete self._localeWatcher;
                }

                self._i18n = null;
            });
        }
    };

    /*  */

    var interpolationComponent = {
        name: 'i18n',
        functional: true,
        props: {
            tag: {
                type: String
            },
            path: {
                type: String,
                required: true
            },
            locale: {
                type: String
            },
            places: {
                type: [Array, Object]
            }
        },
        render: function render (h, ref) {
            var data = ref.data;
            var parent = ref.parent;
            var props = ref.props;
            var slots = ref.slots;

            var $i18n = parent.$i18n;
            if (!$i18n) {
                {
                    warn('Cannot find VueI18n instance!');
                }
                return
            }

            var path = props.path;
            var locale = props.locale;
            var places = props.places;
            var params = slots();
            var children = $i18n.i(
                path,
                locale,
                onlyHasDefaultPlace(params) || places
                    ? useLegacyPlaces(params.default, places)
                    : params
            );

            var tag = props.tag || 'span';
            return tag ? h(tag, data, children) : children
        }
    };

    function onlyHasDefaultPlace (params) {
        var prop;
        for (prop in params) {
            if (prop !== 'default') { return false }
        }
        return Boolean(prop)
    }

    function useLegacyPlaces (children, places) {
        var params = places ? createParamsFromPlaces(places) : {};

        if (!children) { return params }

        // Filter empty text nodes
        children = children.filter(function (child) {
            return child.tag || child.text.trim() !== ''
        });

        var everyPlace = children.every(vnodeHasPlaceAttribute);
        if (everyPlace) {
            warn('`place` attribute is deprecated in next major version. Please switch to Vue slots.');
        }

        return children.reduce(
            everyPlace ? assignChildPlace : assignChildIndex,
            params
        )
    }

    function createParamsFromPlaces (places) {
        {
            warn('`places` prop is deprecated in next major version. Please switch to Vue slots.');
        }

        return Array.isArray(places)
            ? places.reduce(assignChildIndex, {})
            : Object.assign({}, places)
    }

    function assignChildPlace (params, child) {
        if (child.data && child.data.attrs && child.data.attrs.place) {
            params[child.data.attrs.place] = child;
        }
        return params
    }

    function assignChildIndex (params, child, index) {
        params[index] = child;
        return params
    }

    function vnodeHasPlaceAttribute (vnode) {
        return Boolean(vnode.data && vnode.data.attrs && vnode.data.attrs.place)
    }

    /*  */

    var numberComponent = {
        name: 'i18n-n',
        functional: true,
        props: {
            tag: {
                type: String,
                default: 'span'
            },
            value: {
                type: Number,
                required: true
            },
            format: {
                type: [String, Object]
            },
            locale: {
                type: String
            }
        },
        render: function render (h, ref) {
            var props = ref.props;
            var parent = ref.parent;
            var data = ref.data;

            var i18n = parent.$i18n;

            if (!i18n) {
                {
                    warn('Cannot find VueI18n instance!');
                }
                return null
            }

            var key = null;
            var options = null;

            if (typeof props.format === 'string') {
                key = props.format;
            } else if (isObject(props.format)) {
                if (props.format.key) {
                    key = props.format.key;
                }

                // Filter out number format options only
                options = Object.keys(props.format).reduce(function (acc, prop) {
                    var obj;

                    if (numberFormatKeys.includes(prop)) {
                        return Object.assign({}, acc, ( obj = {}, obj[prop] = props.format[prop], obj ))
                    }
                    return acc
                }, null);
            }

            var locale = props.locale || i18n.locale;
            var parts = i18n._ntp(props.value, locale, key, options);

            var values = parts.map(function (part, index) {
                var obj;

                var slot = data.scopedSlots && data.scopedSlots[part.type];
                return slot ? slot(( obj = {}, obj[part.type] = part.value, obj.index = index, obj.parts = parts, obj )) : part.value
            });

            return h(props.tag, {
                attrs: data.attrs,
                'class': data['class'],
                staticClass: data.staticClass
            }, values)
        }
    };

    /*  */

    function bind (el, binding, vnode) {
        if (!assert(el, vnode)) { return }

        t(el, binding, vnode);
    }

    function update (el, binding, vnode, oldVNode) {
        if (!assert(el, vnode)) { return }

        var i18n = vnode.context.$i18n;
        if (localeEqual(el, vnode) &&
            (looseEqual(binding.value, binding.oldValue) &&
                looseEqual(el._localeMessage, i18n.getLocaleMessage(i18n.locale)))) { return }

        t(el, binding, vnode);
    }

    function unbind (el, binding, vnode, oldVNode) {
        var vm = vnode.context;
        if (!vm) {
            warn('Vue instance does not exists in VNode context');
            return
        }

        var i18n = vnode.context.$i18n || {};
        if (!binding.modifiers.preserve && !i18n.preserveDirectiveContent) {
            el.textContent = '';
        }
        el._vt = undefined;
        delete el['_vt'];
        el._locale = undefined;
        delete el['_locale'];
        el._localeMessage = undefined;
        delete el['_localeMessage'];
    }

    function assert (el, vnode) {
        var vm = vnode.context;
        if (!vm) {
            warn('Vue instance does not exists in VNode context');
            return false
        }

        if (!vm.$i18n) {
            warn('VueI18n instance does not exists in Vue instance');
            return false
        }

        return true
    }

    function localeEqual (el, vnode) {
        var vm = vnode.context;
        return el._locale === vm.$i18n.locale
    }

    function t (el, binding, vnode) {
        var ref$1, ref$2;

        var value = binding.value;

        var ref = parseValue(value);
        var path = ref.path;
        var locale = ref.locale;
        var args = ref.args;
        var choice = ref.choice;
        if (!path && !locale && !args) {
            warn('value type not supported');
            return
        }

        if (!path) {
            warn('`path` is required in v-t directive');
            return
        }

        var vm = vnode.context;
        if (choice) {
            el._vt = el.textContent = (ref$1 = vm.$i18n).tc.apply(ref$1, [ path, choice ].concat( makeParams(locale, args) ));
        } else {
            el._vt = el.textContent = (ref$2 = vm.$i18n).t.apply(ref$2, [ path ].concat( makeParams(locale, args) ));
        }
        el._locale = vm.$i18n.locale;
        el._localeMessage = vm.$i18n.getLocaleMessage(vm.$i18n.locale);
    }

    function parseValue (value) {
        var path;
        var locale;
        var args;
        var choice;

        if (typeof value === 'string') {
            path = value;
        } else if (isPlainObject(value)) {
            path = value.path;
            locale = value.locale;
            args = value.args;
            choice = value.choice;
        }

        return { path: path, locale: locale, args: args, choice: choice }
    }

    function makeParams (locale, args) {
        var params = [];

        locale && params.push(locale);
        if (args && (Array.isArray(args) || isPlainObject(args))) {
            params.push(args);
        }

        return params
    }

    var Vue;

    function install (_Vue) {
        /* istanbul ignore if */
        if (install.installed && _Vue === Vue) {
            warn('already installed.');
            return
        }
        install.installed = true;

        Vue = _Vue;

        var version = (Vue.version && Number(Vue.version.split('.')[0])) || -1;
        /* istanbul ignore if */
        if (version < 2) {
            warn(("vue-i18n (" + (install.version) + ") need to use Vue 2.0 or later (Vue: " + (Vue.version) + ")."));
            return
        }

        extend(Vue);
        Vue.mixin(mixin);
        Vue.directive('t', { bind: bind, update: update, unbind: unbind });
        Vue.component(interpolationComponent.name, interpolationComponent);
        Vue.component(numberComponent.name, numberComponent);

        // use simple mergeStrategies to prevent i18n instance lose '__proto__'
        var strats = Vue.config.optionMergeStrategies;
        strats.i18n = function (parentVal, childVal) {
            return childVal === undefined
                ? parentVal
                : childVal
        };
    }

    /*  */

    var BaseFormatter = function BaseFormatter () {
        this._caches = Object.create(null);
    };

    BaseFormatter.prototype.interpolate = function interpolate (message, values) {
        if (!values) {
            return [message]
        }
        var tokens = this._caches[message];
        if (!tokens) {
            tokens = parse(message);
            this._caches[message] = tokens;
        }
        return compile(tokens, values)
    };



    var RE_TOKEN_LIST_VALUE = /^(?:\d)+/;
    var RE_TOKEN_NAMED_VALUE = /^(?:\w)+/;

    function parse (format) {
        var tokens = [];
        var position = 0;

        var text = '';
        while (position < format.length) {
            var char = format[position++];
            if (char === '{') {
                if (text) {
                    tokens.push({ type: 'text', value: text });
                }

                text = '';
                var sub = '';
                char = format[position++];
                while (char !== undefined && char !== '}') {
                    sub += char;
                    char = format[position++];
                }
                var isClosed = char === '}';

                var type = RE_TOKEN_LIST_VALUE.test(sub)
                    ? 'list'
                    : isClosed && RE_TOKEN_NAMED_VALUE.test(sub)
                        ? 'named'
                        : 'unknown';
                tokens.push({ value: sub, type: type });
            } else if (char === '%') {
                // when found rails i18n syntax, skip text capture
                if (format[(position)] !== '{') {
                    text += char;
                }
            } else {
                text += char;
            }
        }

        text && tokens.push({ type: 'text', value: text });

        return tokens
    }

    function compile (tokens, values) {
        var compiled = [];
        var index = 0;

        var mode = Array.isArray(values)
            ? 'list'
            : isObject(values)
                ? 'named'
                : 'unknown';
        if (mode === 'unknown') { return compiled }

        while (index < tokens.length) {
            var token = tokens[index];
            switch (token.type) {
                case 'text':
                    compiled.push(token.value);
                    break
                case 'list':
                    compiled.push(values[parseInt(token.value, 10)]);
                    break
                case 'named':
                    if (mode === 'named') {
                        compiled.push((values)[token.value]);
                    } else {
                        {
                            warn(("Type of token '" + (token.type) + "' and format of value '" + mode + "' don't match!"));
                        }
                    }
                    break
                case 'unknown':
                {
                    warn("Detect 'unknown' type of token!");
                }
                    break
            }
            index++;
        }

        return compiled
    }

    /*  */

    /**
     *  Path parser
     *  - Inspired:
     *    Vue.js Path parser
     */

        // actions
    var APPEND = 0;
    var PUSH = 1;
    var INC_SUB_PATH_DEPTH = 2;
    var PUSH_SUB_PATH = 3;

    // states
    var BEFORE_PATH = 0;
    var IN_PATH = 1;
    var BEFORE_IDENT = 2;
    var IN_IDENT = 3;
    var IN_SUB_PATH = 4;
    var IN_SINGLE_QUOTE = 5;
    var IN_DOUBLE_QUOTE = 6;
    var AFTER_PATH = 7;
    var ERROR = 8;

    var pathStateMachine = [];

    pathStateMachine[BEFORE_PATH] = {
        'ws': [BEFORE_PATH],
        'ident': [IN_IDENT, APPEND],
        '[': [IN_SUB_PATH],
        'eof': [AFTER_PATH]
    };

    pathStateMachine[IN_PATH] = {
        'ws': [IN_PATH],
        '.': [BEFORE_IDENT],
        '[': [IN_SUB_PATH],
        'eof': [AFTER_PATH]
    };

    pathStateMachine[BEFORE_IDENT] = {
        'ws': [BEFORE_IDENT],
        'ident': [IN_IDENT, APPEND],
        '0': [IN_IDENT, APPEND],
        'number': [IN_IDENT, APPEND]
    };

    pathStateMachine[IN_IDENT] = {
        'ident': [IN_IDENT, APPEND],
        '0': [IN_IDENT, APPEND],
        'number': [IN_IDENT, APPEND],
        'ws': [IN_PATH, PUSH],
        '.': [BEFORE_IDENT, PUSH],
        '[': [IN_SUB_PATH, PUSH],
        'eof': [AFTER_PATH, PUSH]
    };

    pathStateMachine[IN_SUB_PATH] = {
        "'": [IN_SINGLE_QUOTE, APPEND],
        '"': [IN_DOUBLE_QUOTE, APPEND],
        '[': [IN_SUB_PATH, INC_SUB_PATH_DEPTH],
        ']': [IN_PATH, PUSH_SUB_PATH],
        'eof': ERROR,
        'else': [IN_SUB_PATH, APPEND]
    };

    pathStateMachine[IN_SINGLE_QUOTE] = {
        "'": [IN_SUB_PATH, APPEND],
        'eof': ERROR,
        'else': [IN_SINGLE_QUOTE, APPEND]
    };

    pathStateMachine[IN_DOUBLE_QUOTE] = {
        '"': [IN_SUB_PATH, APPEND],
        'eof': ERROR,
        'else': [IN_DOUBLE_QUOTE, APPEND]
    };

    /**
     * Check if an expression is a literal value.
     */

    var literalValueRE = /^\s?(?:true|false|-?[\d.]+|'[^']*'|"[^"]*")\s?$/;
    function isLiteral (exp) {
        return literalValueRE.test(exp)
    }

    /**
     * Strip quotes from a string
     */

    function stripQuotes (str) {
        var a = str.charCodeAt(0);
        var b = str.charCodeAt(str.length - 1);
        return a === b && (a === 0x22 || a === 0x27)
            ? str.slice(1, -1)
            : str
    }

    /**
     * Determine the type of a character in a keypath.
     */

    function getPathCharType (ch) {
        if (ch === undefined || ch === null) { return 'eof' }

        var code = ch.charCodeAt(0);

        switch (code) {
            case 0x5B: // [
            case 0x5D: // ]
            case 0x2E: // .
            case 0x22: // "
            case 0x27: // '
                return ch

            case 0x5F: // _
            case 0x24: // $
            case 0x2D: // -
                return 'ident'

            case 0x09: // Tab
            case 0x0A: // Newline
            case 0x0D: // Return
            case 0xA0:  // No-break space
            case 0xFEFF:  // Byte Order Mark
            case 0x2028:  // Line Separator
            case 0x2029:  // Paragraph Separator
                return 'ws'
        }

        return 'ident'
    }

    /**
     * Format a subPath, return its plain form if it is
     * a literal string or number. Otherwise prepend the
     * dynamic indicator (*).
     */

    function formatSubPath (path) {
        var trimmed = path.trim();
        // invalid leading 0
        if (path.charAt(0) === '0' && isNaN(path)) { return false }

        return isLiteral(trimmed) ? stripQuotes(trimmed) : '*' + trimmed
    }

    /**
     * Parse a string path into an array of segments
     */

    function parse$1 (path) {
        var keys = [];
        var index = -1;
        var mode = BEFORE_PATH;
        var subPathDepth = 0;
        var c;
        var key;
        var newChar;
        var type;
        var transition;
        var action;
        var typeMap;
        var actions = [];

        actions[PUSH] = function () {
            if (key !== undefined) {
                keys.push(key);
                key = undefined;
            }
        };

        actions[APPEND] = function () {
            if (key === undefined) {
                key = newChar;
            } else {
                key += newChar;
            }
        };

        actions[INC_SUB_PATH_DEPTH] = function () {
            actions[APPEND]();
            subPathDepth++;
        };

        actions[PUSH_SUB_PATH] = function () {
            if (subPathDepth > 0) {
                subPathDepth--;
                mode = IN_SUB_PATH;
                actions[APPEND]();
            } else {
                subPathDepth = 0;
                if (key === undefined) { return false }
                key = formatSubPath(key);
                if (key === false) {
                    return false
                } else {
                    actions[PUSH]();
                }
            }
        };

        function maybeUnescapeQuote () {
            var nextChar = path[index + 1];
            if ((mode === IN_SINGLE_QUOTE && nextChar === "'") ||
                (mode === IN_DOUBLE_QUOTE && nextChar === '"')) {
                index++;
                newChar = '\\' + nextChar;
                actions[APPEND]();
                return true
            }
        }

        while (mode !== null) {
            index++;
            c = path[index];

            if (c === '\\' && maybeUnescapeQuote()) {
                continue
            }

            type = getPathCharType(c);
            typeMap = pathStateMachine[mode];
            transition = typeMap[type] || typeMap['else'] || ERROR;

            if (transition === ERROR) {
                return // parse error
            }

            mode = transition[0];
            action = actions[transition[1]];
            if (action) {
                newChar = transition[2];
                newChar = newChar === undefined
                    ? c
                    : newChar;
                if (action() === false) {
                    return
                }
            }

            if (mode === AFTER_PATH) {
                return keys
            }
        }
    }





    var I18nPath = function I18nPath () {
        this._cache = Object.create(null);
    };

    /**
     * External parse that check for a cache hit first
     */
    I18nPath.prototype.parsePath = function parsePath (path) {
        var hit = this._cache[path];
        if (!hit) {
            hit = parse$1(path);
            if (hit) {
                this._cache[path] = hit;
            }
        }
        return hit || []
    };

    /**
     * Get path value from path string
     */
    I18nPath.prototype.getPathValue = function getPathValue (obj, path) {
        if (!isObject(obj)) { return null }

        var paths = this.parsePath(path);
        if (paths.length === 0) {
            return null
        } else {
            var length = paths.length;
            var last = obj;
            var i = 0;
            while (i < length) {
                var value = last[paths[i]];
                if (value === undefined) {
                    return null
                }
                last = value;
                i++;
            }

            return last
        }
    };

    /*  */



    var htmlTagMatcher = /<\/?[\w\s="/.':;#-\/]+>/;
    var linkKeyMatcher = /(?:@(?:\.[a-z]+)?:(?:[\w\-_|.]+|\([\w\-_|.]+\)))/g;
    var linkKeyPrefixMatcher = /^@(?:\.([a-z]+))?:/;
    var bracketsMatcher = /[()]/g;
    var formatters = {
        'upper': function (str) { return str.toLocaleUpperCase(); },
        'lower': function (str) { return str.toLocaleLowerCase(); }
    };

    var defaultFormatter = new BaseFormatter();

    var VueI18n = function VueI18n (options) {
        var this$1 = this;
        if ( options === void 0 ) options = {};

        // Auto install if it is not done yet and `window` has `Vue`.
        // To allow users to avoid auto-installation in some cases,
        // this code should be placed here. See #290
        /* istanbul ignore if */
        if (!Vue && typeof window !== 'undefined' && window.Vue) {
            install(window.Vue);
        }

        var locale = options.locale || 'en-US';
        var fallbackLocale = options.fallbackLocale || 'en-US';
        var messages = options.messages || {};
        var dateTimeFormats = options.dateTimeFormats || {};
        var numberFormats = options.numberFormats || {};

        this._vm = null;
        this._formatter = options.formatter || defaultFormatter;
        this._missing = options.missing || null;
        this._root = options.root || null;
        this._sync = options.sync === undefined ? true : !!options.sync;
        this._fallbackRoot = options.fallbackRoot === undefined
            ? true
            : !!options.fallbackRoot;
        this._formatFallbackMessages = options.formatFallbackMessages === undefined
            ? false
            : !!options.formatFallbackMessages;
        this._silentTranslationWarn = options.silentTranslationWarn === undefined
            ? false
            : options.silentTranslationWarn;
        this._silentFallbackWarn = options.silentFallbackWarn === undefined
            ? false
            : !!options.silentFallbackWarn;
        this._dateTimeFormatters = {};
        this._numberFormatters = {};
        this._path = new I18nPath();
        this._dataListeners = [];
        this._preserveDirectiveContent = options.preserveDirectiveContent === undefined
            ? false
            : !!options.preserveDirectiveContent;
        this.pluralizationRules = options.pluralizationRules || {};
        this._warnHtmlInMessage = options.warnHtmlInMessage || 'off';

        this._exist = function (message, key) {
            if (!message || !key) { return false }
            if (!isNull(this$1._path.getPathValue(message, key))) { return true }
            // fallback for flat key
            if (message[key]) { return true }
            return false
        };

        if (this._warnHtmlInMessage === 'warn' || this._warnHtmlInMessage === 'error') {
            Object.keys(messages).forEach(function (locale) {
                this$1._checkLocaleMessage(locale, this$1._warnHtmlInMessage, messages[locale]);
            });
        }

        this._initVM({
            locale: locale,
            fallbackLocale: fallbackLocale,
            messages: messages,
            dateTimeFormats: dateTimeFormats,
            numberFormats: numberFormats
        });
    };

    var prototypeAccessors = { vm: { configurable: true },messages: { configurable: true },dateTimeFormats: { configurable: true },numberFormats: { configurable: true },availableLocales: { configurable: true },locale: { configurable: true },fallbackLocale: { configurable: true },formatFallbackMessages: { configurable: true },missing: { configurable: true },formatter: { configurable: true },silentTranslationWarn: { configurable: true },silentFallbackWarn: { configurable: true },preserveDirectiveContent: { configurable: true },warnHtmlInMessage: { configurable: true } };

    VueI18n.prototype._checkLocaleMessage = function _checkLocaleMessage (locale, level, message) {
        var paths = [];

        var fn = function (level, locale, message, paths) {
            if (isPlainObject(message)) {
                Object.keys(message).forEach(function (key) {
                    var val = message[key];
                    if (isPlainObject(val)) {
                        paths.push(key);
                        paths.push('.');
                        fn(level, locale, val, paths);
                        paths.pop();
                        paths.pop();
                    } else {
                        paths.push(key);
                        fn(level, locale, val, paths);
                        paths.pop();
                    }
                });
            } else if (Array.isArray(message)) {
                message.forEach(function (item, index) {
                    if (isPlainObject(item)) {
                        paths.push(("[" + index + "]"));
                        paths.push('.');
                        fn(level, locale, item, paths);
                        paths.pop();
                        paths.pop();
                    } else {
                        paths.push(("[" + index + "]"));
                        fn(level, locale, item, paths);
                        paths.pop();
                    }
                });
            } else if (typeof message === 'string') {
                var ret = htmlTagMatcher.test(message);
                if (ret) {
                    var msg = "Detected HTML in message '" + message + "' of keypath '" + (paths.join('')) + "' at '" + locale + "'. Consider component interpolation with '<i18n>' to avoid XSS. See https://bit.ly/2ZqJzkp";
                    if (level === 'warn') {
                        warn(msg);
                    } else if (level === 'error') {
                        error(msg);
                    }
                }
            }
        };

        fn(level, locale, message, paths);
    };

    VueI18n.prototype._initVM = function _initVM (data) {
        var silent = Vue.config.silent;
        Vue.config.silent = true;
        this._vm = new Vue({ data: data });
        Vue.config.silent = silent;
    };

    VueI18n.prototype.destroyVM = function destroyVM () {
        this._vm.$destroy();
    };

    VueI18n.prototype.subscribeDataChanging = function subscribeDataChanging (vm) {
        this._dataListeners.push(vm);
    };

    VueI18n.prototype.unsubscribeDataChanging = function unsubscribeDataChanging (vm) {
        remove(this._dataListeners, vm);
    };

    VueI18n.prototype.watchI18nData = function watchI18nData () {
        var self = this;
        return this._vm.$watch('$data', function () {
            var i = self._dataListeners.length;
            while (i--) {
                Vue.nextTick(function () {
                    self._dataListeners[i] && self._dataListeners[i].$forceUpdate();
                });
            }
        }, { deep: true })
    };

    VueI18n.prototype.watchLocale = function watchLocale () {
        /* istanbul ignore if */
        if (!this._sync || !this._root) { return null }
        var target = this._vm;
        return this._root.$i18n.vm.$watch('locale', function (val) {
            target.$set(target, 'locale', val);
            target.$forceUpdate();
        }, { immediate: true })
    };

    prototypeAccessors.vm.get = function () { return this._vm };

    prototypeAccessors.messages.get = function () { return looseClone(this._getMessages()) };
    prototypeAccessors.dateTimeFormats.get = function () { return looseClone(this._getDateTimeFormats()) };
    prototypeAccessors.numberFormats.get = function () { return looseClone(this._getNumberFormats()) };
    prototypeAccessors.availableLocales.get = function () { return Object.keys(this.messages).sort() };

    prototypeAccessors.locale.get = function () { return this._vm.locale };
    prototypeAccessors.locale.set = function (locale) {
        this._vm.$set(this._vm, 'locale', locale);
    };

    prototypeAccessors.fallbackLocale.get = function () { return this._vm.fallbackLocale };
    prototypeAccessors.fallbackLocale.set = function (locale) {
        this._vm.$set(this._vm, 'fallbackLocale', locale);
    };

    prototypeAccessors.formatFallbackMessages.get = function () { return this._formatFallbackMessages };
    prototypeAccessors.formatFallbackMessages.set = function (fallback) { this._formatFallbackMessages = fallback; };

    prototypeAccessors.missing.get = function () { return this._missing };
    prototypeAccessors.missing.set = function (handler) { this._missing = handler; };

    prototypeAccessors.formatter.get = function () { return this._formatter };
    prototypeAccessors.formatter.set = function (formatter) { this._formatter = formatter; };

    prototypeAccessors.silentTranslationWarn.get = function () { return this._silentTranslationWarn };
    prototypeAccessors.silentTranslationWarn.set = function (silent) { this._silentTranslationWarn = silent; };

    prototypeAccessors.silentFallbackWarn.get = function () { return this._silentFallbackWarn };
    prototypeAccessors.silentFallbackWarn.set = function (silent) { this._silentFallbackWarn = silent; };

    prototypeAccessors.preserveDirectiveContent.get = function () { return this._preserveDirectiveContent };
    prototypeAccessors.preserveDirectiveContent.set = function (preserve) { this._preserveDirectiveContent = preserve; };

    prototypeAccessors.warnHtmlInMessage.get = function () { return this._warnHtmlInMessage };
    prototypeAccessors.warnHtmlInMessage.set = function (level) {
        var this$1 = this;

        var orgLevel = this._warnHtmlInMessage;
        this._warnHtmlInMessage = level;
        if (orgLevel !== level && (level === 'warn' || level === 'error')) {
            var messages = this._getMessages();
            Object.keys(messages).forEach(function (locale) {
                this$1._checkLocaleMessage(locale, this$1._warnHtmlInMessage, messages[locale]);
            });
        }
    };

    VueI18n.prototype._getMessages = function _getMessages () { return this._vm.messages };
    VueI18n.prototype._getDateTimeFormats = function _getDateTimeFormats () { return this._vm.dateTimeFormats };
    VueI18n.prototype._getNumberFormats = function _getNumberFormats () { return this._vm.numberFormats };

    VueI18n.prototype._warnDefault = function _warnDefault (locale, key, result, vm, values) {
        if (!isNull(result)) { return result }
        if (this._missing) {
            var missingRet = this._missing.apply(null, [locale, key, vm, values]);
            if (typeof missingRet === 'string') {
                return missingRet
            }
        } else {
            if (!this._isSilentTranslationWarn(key)) {
                warn(
                    "Cannot translate the value of keypath '" + key + "'. " +
                    'Use the value of keypath as default.'
                );
            }
        }

        if (this._formatFallbackMessages) {
            var parsedArgs = parseArgs.apply(void 0, values);
            return this._render(key, 'string', parsedArgs.params, key)
        } else {
            return key
        }
    };

    VueI18n.prototype._isFallbackRoot = function _isFallbackRoot (val) {
        return !val && !isNull(this._root) && this._fallbackRoot
    };

    VueI18n.prototype._isSilentFallbackWarn = function _isSilentFallbackWarn (key) {
        return this._silentFallbackWarn instanceof RegExp
            ? this._silentFallbackWarn.test(key)
            : this._silentFallbackWarn
    };

    VueI18n.prototype._isSilentFallback = function _isSilentFallback (locale, key) {
        return this._isSilentFallbackWarn(key) && (this._isFallbackRoot() || locale !== this.fallbackLocale)
    };

    VueI18n.prototype._isSilentTranslationWarn = function _isSilentTranslationWarn (key) {
        return this._silentTranslationWarn instanceof RegExp
            ? this._silentTranslationWarn.test(key)
            : this._silentTranslationWarn
    };

    VueI18n.prototype._interpolate = function _interpolate (
        locale,
        message,
        key,
        host,
        interpolateMode,
        values,
        visitedLinkStack
    ) {
        if (!message) { return null }

        var pathRet = this._path.getPathValue(message, key);
        if (Array.isArray(pathRet) || isPlainObject(pathRet)) { return pathRet }

        var ret;
        if (isNull(pathRet)) {
            /* istanbul ignore else */
            if (isPlainObject(message)) {
                ret = message[key];
                if (typeof ret !== 'string') {
                    if (!this._isSilentTranslationWarn(key) && !this._isSilentFallback(locale, key)) {
                        warn(("Value of key '" + key + "' is not a string!"));
                    }
                    return null
                }
            } else {
                return null
            }
        } else {
            /* istanbul ignore else */
            if (typeof pathRet === 'string') {
                ret = pathRet;
            } else {
                if (!this._isSilentTranslationWarn(key) && !this._isSilentFallback(locale, key)) {
                    warn(("Value of key '" + key + "' is not a string!"));
                }
                return null
            }
        }

        // Check for the existence of links within the translated string
        if (ret.indexOf('@:') >= 0 || ret.indexOf('@.') >= 0) {
            ret = this._link(locale, message, ret, host, 'raw', values, visitedLinkStack);
        }

        return this._render(ret, interpolateMode, values, key)
    };

    VueI18n.prototype._link = function _link (
        locale,
        message,
        str,
        host,
        interpolateMode,
        values,
        visitedLinkStack
    ) {
        var ret = str;

        // Match all the links within the local
        // We are going to replace each of
        // them with its translation
        var matches = ret.match(linkKeyMatcher);
        for (var idx in matches) {
            // ie compatible: filter custom array
            // prototype method
            if (!matches.hasOwnProperty(idx)) {
                continue
            }
            var link = matches[idx];
            var linkKeyPrefixMatches = link.match(linkKeyPrefixMatcher);
            var linkPrefix = linkKeyPrefixMatches[0];
            var formatterName = linkKeyPrefixMatches[1];

            // Remove the leading @:, @.case: and the brackets
            var linkPlaceholder = link.replace(linkPrefix, '').replace(bracketsMatcher, '');

            if (visitedLinkStack.includes(linkPlaceholder)) {
                {
                    warn(("Circular reference found. \"" + link + "\" is already visited in the chain of " + (visitedLinkStack.reverse().join(' <- '))));
                }
                return ret
            }
            visitedLinkStack.push(linkPlaceholder);

            // Translate the link
            var translated = this._interpolate(
                locale, message, linkPlaceholder, host,
                interpolateMode === 'raw' ? 'string' : interpolateMode,
                interpolateMode === 'raw' ? undefined : values,
                visitedLinkStack
            );

            if (this._isFallbackRoot(translated)) {
                if (!this._isSilentTranslationWarn(linkPlaceholder)) {
                    warn(("Fall back to translate the link placeholder '" + linkPlaceholder + "' with root locale."));
                }
                /* istanbul ignore if */
                if (!this._root) { throw Error('unexpected error') }
                var root = this._root.$i18n;
                translated = root._translate(
                    root._getMessages(), root.locale, root.fallbackLocale,
                    linkPlaceholder, host, interpolateMode, values
                );
            }
            translated = this._warnDefault(
                locale, linkPlaceholder, translated, host,
                Array.isArray(values) ? values : [values]
            );
            if (formatters.hasOwnProperty(formatterName)) {
                translated = formatters[formatterName](translated);
            }

            visitedLinkStack.pop();

            // Replace the link with the translated
            ret = !translated ? ret : ret.replace(link, translated);
        }

        return ret
    };

    VueI18n.prototype._render = function _render (message, interpolateMode, values, path) {
        var ret = this._formatter.interpolate(message, values, path);

        // If the custom formatter refuses to work - apply the default one
        if (!ret) {
            ret = defaultFormatter.interpolate(message, values, path);
        }

        // if interpolateMode is **not** 'string' ('row'),
        // return the compiled data (e.g. ['foo', VNode, 'bar']) with formatter
        return interpolateMode === 'string' ? ret.join('') : ret
    };

    VueI18n.prototype._translate = function _translate (
        messages,
        locale,
        fallback,
        key,
        host,
        interpolateMode,
        args
    ) {
        var res =
            this._interpolate(locale, messages[locale], key, host, interpolateMode, args, [key]);
        if (!isNull(res)) { return res }

        res = this._interpolate(fallback, messages[fallback], key, host, interpolateMode, args, [key]);
        if (!isNull(res)) {
            if (!this._isSilentTranslationWarn(key) && !this._isSilentFallbackWarn(key)) {
                warn(("Fall back to translate the keypath '" + key + "' with '" + fallback + "' locale."));
            }
            return res
        } else {
            return null
        }
    };

    VueI18n.prototype._t = function _t (key, _locale, messages, host) {
        var ref;

        var values = [], len = arguments.length - 4;
        while ( len-- > 0 ) values[ len ] = arguments[ len + 4 ];
        if (!key) { return '' }

        var parsedArgs = parseArgs.apply(void 0, values);
        var locale = parsedArgs.locale || _locale;

        var ret = this._translate(
            messages, locale, this.fallbackLocale, key,
            host, 'string', parsedArgs.params
        );
        if (this._isFallbackRoot(ret)) {
            if (!this._isSilentTranslationWarn(key) && !this._isSilentFallbackWarn(key)) {
                warn(("Fall back to translate the keypath '" + key + "' with root locale."));
            }
            /* istanbul ignore if */
            if (!this._root) { throw Error('unexpected error') }
            return (ref = this._root).$t.apply(ref, [ key ].concat( values ))
        } else {
            return this._warnDefault(locale, key, ret, host, values)
        }
    };

    VueI18n.prototype.t = function t (key) {
        var ref;

        var values = [], len = arguments.length - 1;
        while ( len-- > 0 ) values[ len ] = arguments[ len + 1 ];
        return (ref = this)._t.apply(ref, [ key, this.locale, this._getMessages(), null ].concat( values ))
    };

    VueI18n.prototype._i = function _i (key, locale, messages, host, values) {
        var ret =
            this._translate(messages, locale, this.fallbackLocale, key, host, 'raw', values);
        if (this._isFallbackRoot(ret)) {
            if (!this._isSilentTranslationWarn(key)) {
                warn(("Fall back to interpolate the keypath '" + key + "' with root locale."));
            }
            if (!this._root) { throw Error('unexpected error') }
            return this._root.$i18n.i(key, locale, values)
        } else {
            return this._warnDefault(locale, key, ret, host, [values])
        }
    };

    VueI18n.prototype.i = function i (key, locale, values) {
        /* istanbul ignore if */
        if (!key) { return '' }

        if (typeof locale !== 'string') {
            locale = this.locale;
        }

        return this._i(key, locale, this._getMessages(), null, values)
    };

    VueI18n.prototype._tc = function _tc (
        key,
        _locale,
        messages,
        host,
        choice
    ) {
        var ref;

        var values = [], len = arguments.length - 5;
        while ( len-- > 0 ) values[ len ] = arguments[ len + 5 ];
        if (!key) { return '' }
        if (choice === undefined) {
            choice = 1;
        }

        var predefined = { 'count': choice, 'n': choice };
        var parsedArgs = parseArgs.apply(void 0, values);
        parsedArgs.params = Object.assign(predefined, parsedArgs.params);
        values = parsedArgs.locale === null ? [parsedArgs.params] : [parsedArgs.locale, parsedArgs.params];
        return this.fetchChoice((ref = this)._t.apply(ref, [ key, _locale, messages, host ].concat( values )), choice)
    };

    VueI18n.prototype.fetchChoice = function fetchChoice (message, choice) {
        /* istanbul ignore if */
        if (!message && typeof message !== 'string') { return null }
        var choices = message.split('|');

        choice = this.getChoiceIndex(choice, choices.length);
        if (!choices[choice]) { return message }
        return choices[choice].trim()
    };

    /**
     * @param choice {number} a choice index given by the input to $tc: `$tc('path.to.rule', choiceIndex)`
     * @param choicesLength {number} an overall amount of available choices
     * @returns a final choice index
     */
    VueI18n.prototype.getChoiceIndex = function getChoiceIndex (choice, choicesLength) {
        // Default (old) getChoiceIndex implementation - english-compatible
        var defaultImpl = function (_choice, _choicesLength) {
            _choice = Math.abs(_choice);

            if (_choicesLength === 2) {
                return _choice
                    ? _choice > 1
                        ? 1
                        : 0
                    : 1
            }

            return _choice ? Math.min(_choice, 2) : 0
        };

        if (this.locale in this.pluralizationRules) {
            return this.pluralizationRules[this.locale].apply(this, [choice, choicesLength])
        } else {
            return defaultImpl(choice, choicesLength)
        }
    };

    VueI18n.prototype.tc = function tc (key, choice) {
        var ref;

        var values = [], len = arguments.length - 2;
        while ( len-- > 0 ) values[ len ] = arguments[ len + 2 ];
        return (ref = this)._tc.apply(ref, [ key, this.locale, this._getMessages(), null, choice ].concat( values ))
    };

    VueI18n.prototype._te = function _te (key, locale, messages) {
        var args = [], len = arguments.length - 3;
        while ( len-- > 0 ) args[ len ] = arguments[ len + 3 ];

        var _locale = parseArgs.apply(void 0, args).locale || locale;
        return this._exist(messages[_locale], key)
    };

    VueI18n.prototype.te = function te (key, locale) {
        return this._te(key, this.locale, this._getMessages(), locale)
    };

    VueI18n.prototype.getLocaleMessage = function getLocaleMessage (locale) {
        return looseClone(this._vm.messages[locale] || {})
    };

    VueI18n.prototype.setLocaleMessage = function setLocaleMessage (locale, message) {
        if (this._warnHtmlInMessage === 'warn' || this._warnHtmlInMessage === 'error') {
            this._checkLocaleMessage(locale, this._warnHtmlInMessage, message);
            if (this._warnHtmlInMessage === 'error') { return }
        }
        this._vm.$set(this._vm.messages, locale, message);
    };

    VueI18n.prototype.mergeLocaleMessage = function mergeLocaleMessage (locale, message) {
        if (this._warnHtmlInMessage === 'warn' || this._warnHtmlInMessage === 'error') {
            this._checkLocaleMessage(locale, this._warnHtmlInMessage, message);
            if (this._warnHtmlInMessage === 'error') { return }
        }
        this._vm.$set(this._vm.messages, locale, merge(this._vm.messages[locale] || {}, message));
    };

    VueI18n.prototype.getDateTimeFormat = function getDateTimeFormat (locale) {
        return looseClone(this._vm.dateTimeFormats[locale] || {})
    };

    VueI18n.prototype.setDateTimeFormat = function setDateTimeFormat (locale, format) {
        this._vm.$set(this._vm.dateTimeFormats, locale, format);
    };

    VueI18n.prototype.mergeDateTimeFormat = function mergeDateTimeFormat (locale, format) {
        this._vm.$set(this._vm.dateTimeFormats, locale, merge(this._vm.dateTimeFormats[locale] || {}, format));
    };

    VueI18n.prototype._localizeDateTime = function _localizeDateTime (
        value,
        locale,
        fallback,
        dateTimeFormats,
        key
    ) {
        var _locale = locale;
        var formats = dateTimeFormats[_locale];

        // fallback locale
        if (isNull(formats) || isNull(formats[key])) {
            if (!this._isSilentTranslationWarn(key) && !this._isSilentFallbackWarn(key)) {
                warn(("Fall back to '" + fallback + "' datetime formats from '" + locale + "' datetime formats."));
            }
            _locale = fallback;
            formats = dateTimeFormats[_locale];
        }

        if (isNull(formats) || isNull(formats[key])) {
            return null
        } else {
            var format = formats[key];
            var id = _locale + "__" + key;
            var formatter = this._dateTimeFormatters[id];
            if (!formatter) {
                formatter = this._dateTimeFormatters[id] = new Intl.DateTimeFormat(_locale, format);
            }
            return formatter.format(value)
        }
    };

    VueI18n.prototype._d = function _d (value, locale, key) {
        /* istanbul ignore if */
        if (!VueI18n.availabilities.dateTimeFormat) {
            warn('Cannot format a Date value due to not supported Intl.DateTimeFormat.');
            return ''
        }

        if (!key) {
            return new Intl.DateTimeFormat(locale).format(value)
        }

        var ret =
            this._localizeDateTime(value, locale, this.fallbackLocale, this._getDateTimeFormats(), key);
        if (this._isFallbackRoot(ret)) {
            if (!this._isSilentTranslationWarn(key) && !this._isSilentFallbackWarn(key)) {
                warn(("Fall back to datetime localization of root: key '" + key + "'."));
            }
            /* istanbul ignore if */
            if (!this._root) { throw Error('unexpected error') }
            return this._root.$i18n.d(value, key, locale)
        } else {
            return ret || ''
        }
    };

    VueI18n.prototype.d = function d (value) {
        var args = [], len = arguments.length - 1;
        while ( len-- > 0 ) args[ len ] = arguments[ len + 1 ];

        var locale = this.locale;
        var key = null;

        if (args.length === 1) {
            if (typeof args[0] === 'string') {
                key = args[0];
            } else if (isObject(args[0])) {
                if (args[0].locale) {
                    locale = args[0].locale;
                }
                if (args[0].key) {
                    key = args[0].key;
                }
            }
        } else if (args.length === 2) {
            if (typeof args[0] === 'string') {
                key = args[0];
            }
            if (typeof args[1] === 'string') {
                locale = args[1];
            }
        }

        return this._d(value, locale, key)
    };

    VueI18n.prototype.getNumberFormat = function getNumberFormat (locale) {
        return looseClone(this._vm.numberFormats[locale] || {})
    };

    VueI18n.prototype.setNumberFormat = function setNumberFormat (locale, format) {
        this._vm.$set(this._vm.numberFormats, locale, format);
    };

    VueI18n.prototype.mergeNumberFormat = function mergeNumberFormat (locale, format) {
        this._vm.$set(this._vm.numberFormats, locale, merge(this._vm.numberFormats[locale] || {}, format));
    };

    VueI18n.prototype._getNumberFormatter = function _getNumberFormatter (
        value,
        locale,
        fallback,
        numberFormats,
        key,
        options
    ) {
        var _locale = locale;
        var formats = numberFormats[_locale];

        // fallback locale
        if (isNull(formats) || isNull(formats[key])) {
            if (!this._isSilentTranslationWarn(key) && !this._isSilentFallbackWarn(key)) {
                warn(("Fall back to '" + fallback + "' number formats from '" + locale + "' number formats."));
            }
            _locale = fallback;
            formats = numberFormats[_locale];
        }

        if (isNull(formats) || isNull(formats[key])) {
            return null
        } else {
            var format = formats[key];

            var formatter;
            if (options) {
                // If options specified - create one time number formatter
                formatter = new Intl.NumberFormat(_locale, Object.assign({}, format, options));
            } else {
                var id = _locale + "__" + key;
                formatter = this._numberFormatters[id];
                if (!formatter) {
                    formatter = this._numberFormatters[id] = new Intl.NumberFormat(_locale, format);
                }
            }
            return formatter
        }
    };

    VueI18n.prototype._n = function _n (value, locale, key, options) {
        /* istanbul ignore if */
        if (!VueI18n.availabilities.numberFormat) {
            {
                warn('Cannot format a Number value due to not supported Intl.NumberFormat.');
            }
            return ''
        }

        if (!key) {
            var nf = !options ? new Intl.NumberFormat(locale) : new Intl.NumberFormat(locale, options);
            return nf.format(value)
        }

        var formatter = this._getNumberFormatter(value, locale, this.fallbackLocale, this._getNumberFormats(), key, options);
        var ret = formatter && formatter.format(value);
        if (this._isFallbackRoot(ret)) {
            if (!this._isSilentTranslationWarn(key) && !this._isSilentFallbackWarn(key)) {
                warn(("Fall back to number localization of root: key '" + key + "'."));
            }
            /* istanbul ignore if */
            if (!this._root) { throw Error('unexpected error') }
            return this._root.$i18n.n(value, Object.assign({}, { key: key, locale: locale }, options))
        } else {
            return ret || ''
        }
    };

    VueI18n.prototype.n = function n (value) {
        var args = [], len = arguments.length - 1;
        while ( len-- > 0 ) args[ len ] = arguments[ len + 1 ];

        var locale = this.locale;
        var key = null;
        var options = null;

        if (args.length === 1) {
            if (typeof args[0] === 'string') {
                key = args[0];
            } else if (isObject(args[0])) {
                if (args[0].locale) {
                    locale = args[0].locale;
                }
                if (args[0].key) {
                    key = args[0].key;
                }

                // Filter out number format options only
                options = Object.keys(args[0]).reduce(function (acc, key) {
                    var obj;

                    if (numberFormatKeys.includes(key)) {
                        return Object.assign({}, acc, ( obj = {}, obj[key] = args[0][key], obj ))
                    }
                    return acc
                }, null);
            }
        } else if (args.length === 2) {
            if (typeof args[0] === 'string') {
                key = args[0];
            }
            if (typeof args[1] === 'string') {
                locale = args[1];
            }
        }

        return this._n(value, locale, key, options)
    };

    VueI18n.prototype._ntp = function _ntp (value, locale, key, options) {
        /* istanbul ignore if */
        if (!VueI18n.availabilities.numberFormat) {
            {
                warn('Cannot format to parts a Number value due to not supported Intl.NumberFormat.');
            }
            return []
        }

        if (!key) {
            var nf = !options ? new Intl.NumberFormat(locale) : new Intl.NumberFormat(locale, options);
            return nf.formatToParts(value)
        }

        var formatter = this._getNumberFormatter(value, locale, this.fallbackLocale, this._getNumberFormats(), key, options);
        var ret = formatter && formatter.formatToParts(value);
        if (this._isFallbackRoot(ret)) {
            if (!this._isSilentTranslationWarn(key)) {
                warn(("Fall back to format number to parts of root: key '" + key + "' ."));
            }
            /* istanbul ignore if */
            if (!this._root) { throw Error('unexpected error') }
            return this._root.$i18n._ntp(value, locale, key, options)
        } else {
            return ret || []
        }
    };

    Object.defineProperties( VueI18n.prototype, prototypeAccessors );

    var availabilities;
    // $FlowFixMe
    Object.defineProperty(VueI18n, 'availabilities', {
        get: function get () {
            if (!availabilities) {
                var intlDefined = typeof Intl !== 'undefined';
                availabilities = {
                    dateTimeFormat: intlDefined && typeof Intl.DateTimeFormat !== 'undefined',
                    numberFormat: intlDefined && typeof Intl.NumberFormat !== 'undefined'
                };
            }

            return availabilities
        }
    });

    VueI18n.install = install;
    VueI18n.version = '8.14.1';

    return VueI18n;

})));